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Mechanical Technology — April 2015

39

Products and services

The vertical turbine slurry

pump – VTSP

Weir Minerals Floway Pumps’

patented VTSP addresses the

market need for a longer lasting,

abrasive-solids handling vertical

turbine pump. Following several

years of design innovation, re-

search and testing, the VTSP

has been demonstrated to

last four times longer in solids

handling services when compared

and tested with the Floway

®

verti-

cal turbine pump bearing assembly.

The patented VTSP bearing de-

sign allows for continuous operation

in services with a maximum solid

content of 10% by weight and tem-

porary excursions of up to 20%.

This design results in a longer mean

time between required maintenance

and an overall reduction in the

customer’s total operational costs.

“We listened to our customers

when they expressed the need for

an abrasive-solids handling verti-

cal turbine pump which would last

longer than the available designs

in the market today,” says Barry

Cockerham, managing director of

Weir Minerals Floway Pumps in

Fresno, California. “We responded

with the VTSP, which we believe will

provide extended life while main-

taining the highest product quality.”

“Wear life is critical in many

pump applications and the existing technology

was not producing acceptable results”, adds

Daniel Boldt, product engineering manager

at Weir Minerals Floway Pumps. “Due to the

demanding nature of abrasive services, design

innovation was required to realise a significant

improvement in wear life. After extensive design

work and both in-house and field testing, the

new VTSP product line demonstrates a notable

advantage over traditional vertical turbine

designs.”

Weir Minerals Floway Pumps has supplied

pumps and processing products for the Minerals

industry for over 80 years. “We are dedicated

to engineering, manufacturing and servicing

high quality, long lasting products such as the

VTSP,” Cockerham concludes.

www.weirminerals.com

The Dodge brand has been synonymous

with the best the industry has to offer for

more than 125 years, according to Bear-

ings International’s bearings manager,

Ross Trevelyan. “This tried-and-tested

product offers a host of important cost

saving benefits and enjoys wide accep-

tance within our local market,” he says.

The Dodge MTA mechanical drive

range provides a heavy-duty solution for

any bulk materials handling application

that requires a shaft-mounted reducer.

They are predominantly used in the

quarrying and aggregate sectors but are

equally at home in the coal, iron-ore,

wood and sugar industries. “The fact that

the Dodge MTA units enable any brand of

IEC B5 flange motor to be used with the

reducers adds to the product’s popularity.

We noted a steady increase in demand

for the units over the past two years and

in September 2014 the MTA range was

extended from the initially available 2,

4 and 6 sizes, to also include sizes 3,

5, 7 and 8. This has enabled us to offer

customers the complete MTA mechanical

drive range from 1.5 kW to 75 kW, based

on output speed and a service factor of

1.4,” Trevelyan reveals.

The Dodge range includes the tradi-

tional torque arm branded series (the belt

driven Dodge Torque-Arm II shaft-mount-

ed reducers) and the motorised MTA unit.

The torque arm units, originally invented

in 1946 and developed over time, are

shaft mounted gear products and belt-

driven, with MTA motorised versions also

available. A key feature on both units

is the exclusive, twin-tapered bushing.

“This provides a sturdy, concentric grip

SKF has signed a one-year contract with

Italian HSD SpA for the supply

of super precision bearings

for the electro-spindles

used in the woodwork-

ing segment. “This

order is of significant

importance because

it gives us an op-

portunity to increase

our market share in

the woodworking seg-

ment in which we see

a large potential.

“Also, we are very glad

to gain HSD’s confidence by

showing that we can meet their

Drive solutions with motorised torque arms – MTAs

on the driven shaft on both sides of the

reducer, which eliminates the excessive

wobble and fretting corrosion normally

associated with single-bushed shaft-

mounted reducers,” explains Trevelyan.

Dodge’s bushings are fully split to

completely grip the driven shaft and ac-

cording to Trevelyan, fitment and removal

of the bushings are simple processes.

Dodge’s bushings are manufactured

from ductile iron for shock resistance.

The units are equipped with taper roller

bearings providing an average minimum

bearing life span of 25 000 hours which

is compliant with the American Gear

Manufacturers Association standards.

“Dodge MTAs offer solutions for

all industries and we have invested in

substantial stock to service the local

market’s diverse applications,” concludes

Trevelyan.

www.bearings.co.za

Dodge motorised torque arm units (MTAs)

are used in industries where a shaft-

mounted reducer is required particularly in

the quarrying and aggregate sectors.

Super precision bearings for the woodworking segment

high expectations on quality, technol-

ogy and future development,”

says Ezio Miglietta, SKF in-

dustrial market, sales and

marketing.

HSD SpA is a leading

global supplier of elec-

tro-spindles for mill-

ing, drilling and edge

banding in wood,

aluminium and plas-

tic, where high speed

capability, reduced

friction, low noise and

vibration levels are im-

portant requirements. The

SKF super precision bearings

enable all these requirements to be met.

The contract includes four sizes of

sealed super-precision hybrid bearings,

which will be produced in SKF’s factory

in Torino, Italy.

www.skf.com